nkeynes@1160: /**
nkeynes@1160:  * $Id$
nkeynes@1160:  *
nkeynes@1160:  * Generic GL vertex buffer/vertex array support
nkeynes@1160:  *
nkeynes@1160:  * Copyright (c) 2011 Nathan Keynes.
nkeynes@1160:  *
nkeynes@1160:  * This program is free software; you can redistribute it and/or modify
nkeynes@1160:  * it under the terms of the GNU General Public License as published by
nkeynes@1160:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@1160:  * (at your option) any later version.
nkeynes@1160:  *
nkeynes@1160:  * This program is distributed in the hope that it will be useful,
nkeynes@1160:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@1160:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@1160:  * GNU General Public License for more details.
nkeynes@1160:  */
nkeynes@1160: 
nkeynes@1160: #define GL_GLEXT_PROTOTYPES 1
nkeynes@1160: 
nkeynes@1160: #include <assert.h>
nkeynes@1160: #include <stdlib.h>
nkeynes@1160: #include <sys/mman.h>
nkeynes@1160: #include "lxdream.h"
nkeynes@1160: #include "display.h"
nkeynes@1160: #include "drivers/video_gl.h"
nkeynes@1160: #include "pvr2/glutil.h"
nkeynes@1160: 
nkeynes@1160: #define MIN_VERTEX_ARRAY_SIZE (1024*1024)
nkeynes@1160: 
nkeynes@1160: vertex_buffer_t vertex_buffer_new( vertex_buffer_t vtable )
nkeynes@1160: {
nkeynes@1160:     vertex_buffer_t buf = g_malloc(sizeof(struct vertex_buffer));
nkeynes@1160:     memcpy( buf, vtable, sizeof(struct vertex_buffer));
nkeynes@1160:     buf->data = 0;
nkeynes@1160:     buf->id = 0;
nkeynes@1160:     buf->mapped_size = buf->capacity = 0;
nkeynes@1160:     buf->fence = 0;
nkeynes@1160:     return buf;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: /******************************* Default ***********************************/
nkeynes@1160: 
nkeynes@1160: static void *def_map( vertex_buffer_t buf, uint32_t size )
nkeynes@1160: {
nkeynes@1160:     buf->mapped_size = size;
nkeynes@1160:     if( size < MIN_VERTEX_ARRAY_SIZE )
nkeynes@1160:         size = MIN_VERTEX_ARRAY_SIZE;
nkeynes@1160:     if( size > buf->capacity ) {
nkeynes@1160:         g_free(buf->data);
nkeynes@1160:         buf->data = g_malloc(size);
nkeynes@1160:         buf->capacity = size;
nkeynes@1160:     }
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void *def_unmap( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void def_finished( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void def_destroy( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     g_free(buf->data);
nkeynes@1160:     buf->data = NULL;
nkeynes@1160:     g_free(buf);
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static struct vertex_buffer def_vtable = { def_map, def_unmap, def_finished, def_destroy };
nkeynes@1160: 
nkeynes@1160: static vertex_buffer_t def_create_buffer( )
nkeynes@1160: {
nkeynes@1160:     return vertex_buffer_new( &def_vtable );
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: /************************** vertex_array_range *****************************/
nkeynes@1160: 
nkeynes@1160: /**
nkeynes@1160:  * VAR extensions like the buffer to be allocated on page boundaries.
nkeynes@1160:  */
nkeynes@1160: static void var_alloc_pages( vertex_buffer_t buf, uint32_t size )
nkeynes@1160: {
nkeynes@1160:     if( size < MIN_VERTEX_ARRAY_SIZE )
nkeynes@1160:         size = MIN_VERTEX_ARRAY_SIZE;
nkeynes@1160:     if( size > buf->capacity ) {
nkeynes@1160:         size = (size + 4096-1) & (~(4096-1));
nkeynes@1160:         if( buf->data != NULL ) {
nkeynes@1160:             munmap( buf->data, buf->capacity );
nkeynes@1160:         }
nkeynes@1160:         buf->data = mmap( NULL, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
nkeynes@1160:         assert( buf->data != MAP_FAILED );
nkeynes@1160:         buf->capacity = size;
nkeynes@1160:     }
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: #ifdef APPLE_BUILD
nkeynes@1160: 
nkeynes@1160: static void *apple_map( vertex_buffer_t buf, uint32_t size )
nkeynes@1160: {
nkeynes@1160:     glFinishFenceAPPLE(buf->fence);
nkeynes@1160:     var_alloc_pages( buf, size );
nkeynes@1160:     glVertexArrayRangeAPPLE(size, buf->data);
nkeynes@1160:     buf->mapped_size = size;
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void *apple_unmap( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glFlushVertexArrayRangeAPPLE(buf->mapped_size, buf->data);
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void apple_finished( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glSetFenceAPPLE(buf->fence);
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void apple_destroy( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glVertexArrayRangeAPPLE(0,0);
nkeynes@1160:     glDeleteFencesAPPLE(1, &buf->fence);
nkeynes@1160:     munmap( buf->data, buf->capacity );
nkeynes@1160:     g_free(buf);
nkeynes@1160: }
nkeynes@1160: static struct vertex_buffer apple_vtable = { apple_map, apple_unmap, apple_finished, apple_destroy };
nkeynes@1160: 
nkeynes@1160: static vertex_buffer_t apple_create_buffer( uint32_t size )
nkeynes@1160: {
nkeynes@1160:     vertex_buffer_t buf = vertex_buffer_new( &apple_vtable );
nkeynes@1160:     glGenFencesAPPLE(1, &buf->fence);
nkeynes@1164:     glSetFenceAPPLE(buf->fence);    
nkeynes@1160:     return buf;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: #endif
nkeynes@1160: 
nkeynes@1160: #ifdef GL_VERTEX_ARRAY_RANGE_NV
nkeynes@1160: 
nkeynes@1164: #pragma weak glVertexArrayRangeNV
nkeynes@1164: #pragma weak glFlushVertexArrayRangeNV
nkeynes@1164: #pragma weak glFinishFenceNV
nkeynes@1164: #pragma weak glSetFenceNV
nkeynes@1164: #pragma weak glGenFencesNV
nkeynes@1164: #pragma weak glDeleteFencesNV
nkeynes@1164: 
nkeynes@1160: static void *nv_map( vertex_buffer_t buf, uint32_t size )
nkeynes@1160: {
nkeynes@1160:     glFinishFenceNV(buf->fence);
nkeynes@1160:     var_alloc_pages( buf, size );
nkeynes@1160:     glVertexArrayRangeNV(size, buf->data);
nkeynes@1160:     buf->mapped_size = size;
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: static void *nv_unmap( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glFlushVertexArrayRangeNV();
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void nv_finished( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glSetFenceNV(buf->fence, GL_ALL_COMPLETED_NV);
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void nv_destroy( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glVertexArrayRangeNV(0,0);
nkeynes@1160:     glDeleteFencesNV(1, &buf->fence);
nkeynes@1160:     munmap( buf->data, buf->capacity );
nkeynes@1160:     g_free(buf);
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static struct vertex_buffer nv_vtable = { nv_map, nv_unmap, nv_finished, nv_destroy };
nkeynes@1160: 
nkeynes@1160: static vertex_buffer_t nv_create_buffer( uint32_t size )
nkeynes@1160: {
nkeynes@1160:     vertex_buffer_t buf = vertex_buffer_new( &nv_vtable );
nkeynes@1160:     glGenFencesNV(1, &buf->fence);
nkeynes@1164:     glSetFenceNV(buf->fence, GL_ALL_COMPLETED_NV);
nkeynes@1160:     return buf;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: #endif /* !GL_VERTEX_ARRAY_RANGE_NV */
nkeynes@1160: 
nkeynes@1160: /************************** vertex_buffer_object *****************************/
nkeynes@1160: 
nkeynes@1160: #ifdef GL_ARRAY_BUFFER_ARB
nkeynes@1160: 
nkeynes@1160: static void *vbo_map( vertex_buffer_t buf, uint32_t size )
nkeynes@1160: {
nkeynes@1160:     glBindBufferARB( GL_ARRAY_BUFFER_ARB, buf->id );
nkeynes@1160:      if( size > buf->capacity ) {
nkeynes@1160:          glBufferDataARB( GL_ARRAY_BUFFER_ARB, size, NULL, GL_STREAM_DRAW_ARB );
nkeynes@1160:          assert( gl_check_error("Allocating vbo data") );
nkeynes@1160:          buf->capacity = size;
nkeynes@1160:     }
nkeynes@1160:     buf->data = glMapBufferARB( GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB );
nkeynes@1160:     buf->mapped_size = buf->capacity;
nkeynes@1160:     return buf->data;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void *vbo_unmap( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glUnmapBufferARB( GL_ARRAY_BUFFER_ARB );
nkeynes@1160:     return NULL;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void vbo_finished( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static void vbo_destroy( vertex_buffer_t buf )
nkeynes@1160: {
nkeynes@1160:     glBindBufferARB( GL_ARRAY_BUFFER_ARB, 0 );
nkeynes@1160:     glDeleteBuffersARB( 1, &buf->id );
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: static struct vertex_buffer vbo_vtable = { vbo_map, vbo_unmap, vbo_finished, vbo_destroy };
nkeynes@1160: 
nkeynes@1160: static vertex_buffer_t vbo_create_buffer( uint32_t size )
nkeynes@1160: {
nkeynes@1160:     vertex_buffer_t buf = vertex_buffer_new( &vbo_vtable );
nkeynes@1160:     glGenBuffersARB( 1, &buf->id );
nkeynes@1160:     return buf;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: #endif
nkeynes@1160: 
nkeynes@1160: /**
nkeynes@1160:  * Auto-detect the supported vertex buffer types, and select between them.
nkeynes@1160:  * Use vertex_buffer_object if available, otherwise vertex_array_range,
nkeynes@1160:  * otherwise just pure host buffers.
nkeynes@1160:  */
nkeynes@1160: void gl_vbo_init( display_driver_t driver ) {
nkeynes@1160: /* VBOs are disabled for now as they won't work with the triangle sorting,
nkeynes@1160:  * plus they seem to be slower than the other options anyway.
nkeynes@1160:  */
nkeynes@1160: #ifdef ENABLE_VBO
nkeynes@1160: #ifdef GL_ARRAY_BUFFER_ARB
nkeynes@1160:     if( isGLVertexBufferSupported() ) {
nkeynes@1160:         driver->create_vertex_buffer = vbo_create_buffer;
nkeynes@1160:         return;
nkeynes@1160:     }
nkeynes@1160: #endif
nkeynes@1160: #endif
nkeynes@1160: 
nkeynes@1160: #ifdef APPLE_BUILD
nkeynes@1160:     if( isGLExtensionSupported("GL_APPLE_vertex_array_range") &&
nkeynes@1160:             isGLExtensionSupported("GL_APPLE_fence") ) {
nkeynes@1160:         glEnableClientState( GL_VERTEX_ARRAY_RANGE_APPLE );
nkeynes@1160:         driver->create_vertex_buffer = apple_create_buffer;
nkeynes@1160:         return;
nkeynes@1160:     }
nkeynes@1160: #endif
nkeynes@1160: 
nkeynes@1160: #ifdef GL_VERTEX_ARRAY_RANGE_NV
nkeynes@1160:     if( isGLExtensionSupported("GL_NV_vertex_array_range") &&
nkeynes@1160:             isGLExtensionSupported("GL_NV_fence") ) {
nkeynes@1160:         glEnableClientState( GL_VERTEX_ARRAY_RANGE_NV );
nkeynes@1160:         driver->create_vertex_buffer = nv_create_buffer;
nkeynes@1160:         return;
nkeynes@1160:     }
nkeynes@1160: #endif
nkeynes@1160:     driver->create_vertex_buffer = def_create_buffer;
nkeynes@1160: }
nkeynes@1160: 
nkeynes@1160: void gl_vbo_fallback_init( display_driver_t driver ) {
nkeynes@1160:     driver->create_vertex_buffer = def_create_buffer;
nkeynes@1160: }